cos（-x）
    14t^2-120t十465=0
    Xx1.3=13
    (0.0002-x)(0.0003-1.5x)^1.5=(0.00005085-x)(0.00019915-1.5x)^1.5
    (0.0002-x)(0.0003-1.5x)^1.5=(0.00005-x)(0.0002-1.5x)^1.5
    (15.9*10^5+0.432/x^2)[x-0.0371*10^(-3)] = 8.314*348.15
    (15.9*10^5+0.432*300/17*300*17/x^2)[x-300/17*0.0371*10^(-3)]=300/17*8.314*348.15
    x-x*0.05-（X+704171.84）*0.0003=704171.84
    3.3/（10000+x）*x
    x^(2)-198.6 x-22500=0
    arctanx=45
    arctan（x/10）+arctanx=90
    x^2*（x^2/100+1）*（x^2+1）=6400
    arctanx+arctan（x/10）=30
    （8.82x-21）*(x-2.38)=216.7
     （1/6x）+4=2/3（21-x）
    （8.82x+37.4）*(9-x)=216.7
    （7.38x+24.4）*(9-x)=216.7
    （7.38x+24.4）(9-x)=216.7
    （7.38x+24.4）(9-x)=325

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